To go down in a long list of things executives said wouldn’t happen, that ended up happening.
Read an book on space/aerospace engineering from the 1980s and look at how many things happened. Supersonic was a huge bust. (The Concorde is closer in time to wooden biplanes than to today. Routine supersonic travel still nowhere on the horizon.) Energy technology has been a huge disappointment. When I grew up, we were going to have nuclear fusion, expanding the scope of what society can do. Today we’re back to wind…
With the caveat: for commercial travel. And even then it’s partly due to noise restrictions. It’s not like the technology for supersonic flight isn’t widespread.